Top 10 Best compression union fittings in 2026

Last Updated - 6/16/2026

🏆Best Choice

ChillWaves

ChillWaves Brass Compression Tube Fitting, 1/2" OD x 1/2" OD Compression Union Connector(5-PACK)

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•SIZE - 1/2" Tube OD x 1/2" Tube OD, Compression Tube Fitting mainly consists of a fitting body with a 24 degree tapered hole, a ferrule with a sharp inner edge, and a nut for compression.
•MATERIAL - Made of high-quality brass, with strong wear and corrosion resistance, high compressive strength, durability, low magnetic permeability and high temperature ductility.
•Use - Suitable for oil, gas, water and other non-corrosive or corrosive pipeline systems, temperature and pressure resistance, good sealing and repeatability, no need for welding and flaring tools, easy disassembly, installation and maintenance, etc.
•WORKING PRESSURE & TEMPERATURE - 1200PSI maximum working pressure, temperature range -65°F to +250°F (-53°C to +121°C)
•WORKING PRINCIPLE - Compression Tube Fitting is to compress the ferrule by thread interlocking, and the two ends of the inner diameter of the ferrule tightly wrap the tube due to radial shrinkage, which plays a sealing role and realizes the sealing and tightening effect between the joint and the tube.

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$13.99

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Taiidaues

46pcs Brass Compression Tube Pipe Fittings Assortment Kit, Taiidaues 1/8" 3/16" 1/4" 5/16" 3/8" 1/2" OD Compression Union Connector & Compression Sleeves Ferrules

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•High Quality - Our brass compression fittings kit is made of high-quality brass, with strong wear, corrosion resistance, high compressive strength, durability, low magnetic permeability and high temperature ductility
•Widely Use- Brass compression tube fittings meet specifications and standards of ASA, ASME asn SAE. Good sealing and repeatability, temperature and pressure resistance. Perfect fit for oil, gas, water and other non-corrosive or corrosive pipeline systems, no need for welding and flaring tools, easy disassembly, installation and maintenance, etc
•WORKING PRESSURE & TEMPERATURE - 2000 PSI maximum working pressure, temperature range -65°F to +250°F (-53°C to +121°C)
•You Will Get- Brass air line compression fittings contain: 1/8"-4 pcs, 3/16"-4 pcs, 1/4"-4 pcs, 5/16"-4 pcs, 3/8"-4pcs,and 1/2"-2 pcs compression coupling. 1/8"-4 pcs, 3/16"-4 pcs, 1/4"-4 pcs, 5/16"-4 pcs, 3/8"-4 pcs,and 1/2" -4 pcs compression sleeves ferrules. Total 46 pcs Brass Compression Fittings
•Tips- These copper tubing fittings contain lead and are not allowed by federal law to be installed for potable water use in the U.S.A. and its territories

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$29.99

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bouti1583

Ice Maker Water Line Brass Compression Tube Fitting, Union, 3/8” OD x 3/8” OD, 2 Pack

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•✅ Pack of two 3/8” OD x 3/8” OD tube fittings
•✅ Safe to use on copper or plastic water line tubing
•✅ Hex head on both sides of adapter provide excellent grip during installation
•✅ High quality and deep threads allow the fittings to bite better providing perfect compression for a leak-free connection
•✅ Three piece construction - nut, sleeve and body with attached insert Use with copper, brass, aluminum, or plastic tubing, Meets specifications and standards of ASA, ASME asn SAE.

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$6.95

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Legines

Legines Brass Compression Tube Fitting, Union, 1/4" OD x 1/4" OD Coupler, Pack of 2

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•Three piece construction - nut, sleeve and body with attached insert Use with copper, brass, aluminum, or plastic tubing
•Manufactured for low and medium pressure tubing connection work where excessive vibration or tube movement is not involved.
•Use with copper,aluminum and thermoplastic tub-ing.Not recommended for steel tubing.
•Not recommended for application using gas eous media.
•Meets specifications and standards of ASA, ASME asn SAE.

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$6.99

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Yoebor

Metalwork 304 Stainless Steel Compression Tube Fitting Union W/Double Ferrule 1/4" OD x 1/4" OD (2 Pcs)

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•Union for connecting and disconnecting two pipes more easily than couplings.
•“OD” is the size of the tube you will connect, not the size of the female compression.
•Type 304 stainless steel for higher strength and greater corrosion resistance; Operating temperatures: below 450℃/ Working pressure: 25Mpa-40Mpa
•Only be used for connecting hard tube, such as steel tube, copper tube, etc. If you want to connect hoses, please use it with a compression insert bush. Otherwise, it may cause leakage.
•Please ensure the cut of the connecting tube is flat, otherwise it may also cause leakage.

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$8.99

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HASAOMOI

HASAOMOI 48 PCS DOT Brass Compression Air Brake Nylon Tubing Fittings,1/4" 1/8" 3/8" 1/2" 5/16" OD Straight Union Fitting Assortment Kit, DOT Air Line Fittings for Truck or Industrial Air System

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•PREMIUM MATERIAL: The dot air line fitting is made of high quality CA360 brass, meets D.O.T FMVSS 571.106 and Air Brake System Requirements. With corrosion resistance, high temperature ductility and low permeability. Long service use, dot air brake fitting type: 1/8" 1/4", 3/8", 1/2", 5/8"
•WORKING PRESSURE & TEMPERATURE: Air line fittings pressure resistance, not easy to trip. Air brake fittings working pressure from vacuum max to 300 PSI. Temperature Range: -65° F to +200° F
•EASY TO INSTALL: Our dot air fitting kit quicks disconnect push tubing in, you need to use tools to fix loose parts to handle in tight places so that use will be firmer and not easy to fall off. And pieces that contain a threaded end already have sealant pre-applied to provide a secure connection
•WIDELY APPLICATION: Air brake fittings assortment kit can be used with air systems, copper tubing in airline brake systems, which is perfect for automotive car or truck repair, air operated seats, operating gauges, air horns, industrial workshops, air brake connections, towing machine hose connection and air brake connections or lawn mower repair
•PACKAGE INCLUDES: The dot air compression union fittings kit package includes 48 pcs: 2 pcs 1/8" x 1/8" compression tube union, 6 pcs 1/4" x 1/4" compression tube union, 4 pcs 3/8" x 3/8" compression tube union, 2 pcs 1/2" x 1/2" compression tube union, 2 pc 5/16" x 5/16" compression tube union,32pcs sleeves ferrules,1pc 4m teflon tape

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$28.99

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TL TOOLEGIN

Brass Compression Tube Fitting, Union, 1/4" OD x 1/4" OD, 5pcs

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•Size: 1/4" Tube OD x 1/4" Tube OD.
•Three piece construction - nut, sleeve and body with attached insert.Easy to disassemble no flaring tool required.
•Use with copper, brass, aluminum, or plastic tubing. -65 Degree F to +250 degree F temperature range. Standard fittings use short nuts.
•Brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability
•These fittings contain lead and are not allowed by federal law to be installed for potable water use in the U.S.A. and its territories.

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$9.99

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Dorman

Dorman 800-202 High Pressure Compression Union Rated For 5000 PSI 3/16 In.

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•Available in many different styles, including elbows, union, and tees
•A large variety of tube diameters and pipe sizes available
•Conveniently packaged in diverse piece counts to assist with both small and large projects
•Also suitable for a broad range of industrial and commercial uses
•Backed by team of engineers and quality control specialists in the United States

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$13.62

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uxcell

uxcell 5Pcs Brass Compression Tube Fitting, 4mm Tube OD, NPT Thread, Compression Union & Sleeves, Brass Straight Coupling Adapter

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•Colour: Brass; Material: Brass; Total Width: 13mm / 0.51"; Intermediate Width: 13mm / 0.51"; Tube Diameter: 4mm / 0.16"; Total Length: 30mm / 1.18"; Disassembled Length: 10mm/18mm/10mm / 0.39"/0.71"/0.39"; Hexagonal Side Width (Both Sides):12mm / 0.47"; Hexagonal Side Width (Middle Head):12mm / 0.47"; Package Content: 5Pcs x Brass Compression Tube Fitting
•Material: Our compression tube fittings are made of brass, which has high compressive strength and high-temperature ductility. They are strong and durable, not easy to rust or fade, and can be used for a long time.
•Design: The compression fittings have compression rings and sleeves, which can firmly fix the pipes in the fittings by rotating and pressing them to achieve the connection of the pipelines; they can ensure a tight connection and prevent leakage.
•Easy To Use: This joint is good in air tightness and pressure resistance, not easy to fall off, easy to install, and does not require welding and flaring tools. Just insert the pipe into the joint, rotate it, and tighten it to complete the connection.
•Wide Application: You can quickly install or remove compression pipe fittings as needed, easy to repair or replace. They are suitable for non-corrosive or corrosive piping systems such as oil, gas, and water, and can be used for water meters, valves, etc.

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$11.49

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RM Real Men

Real Men 28in Nylon Leggings A Pouch Lrg 2pk Blk/Gry Running Tights For Men Mens Leggings For Sports Mens Thermals Bottom Men's Thermal Underwear Union Suits Men's Sports Compression Pants & Tights

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•DON'T COMPROMISE - Real Men Compression Gear is designed with the athlete in mind. The superior support pouch technology in these men leggings for sports will provide the space, comfort and compression where you need it during training and competition.
•DOESN'T SMASH THE PACKAGE - Most pouch underwear smash a mans package and call it support. Our performance pouch technology gives compression where needed but provides your package with the space you deserve during work & play.
•SUPERIOR SMOOTH MATERIAL - Our engineered and tested nylon/spandex pouch underwear are extremely soft compared to most competitors polyester products
•Feel the Real Men difference while our pouch underwear provide the support, performance, and results you desire.
•RM compression leggings for men help minimize muscle fatigue from heavy workouts but are comfortable and flexible enough to served as your go to pouch underwear.

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$49.99

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